沙坪2级水电站闸坝基坑开挖爆破振动监测与爆破方案优化  

Blasting Vibration Monitoring and Plan Optimization of Dam Foundation Pit Excavation at ShapingⅡ Hydropower Station

作　　者：袁艳玲[1] 申嘉荣 李洪涛[1] 姚强[1] 王志强[1] 

机构地区：[1]四川大学水利水电学院,成都610065

出　　处：《中国农村水利水电》2015年第2期140-142,147,共4页China Rural Water and Hydropower

基　　金：国家自然科学基金资助项目(51009104);大学生创新创业训练计划国家级项目(201410610069);大学生科研训练计划项目(20141242)

摘　　要：为寻求科学的爆破控制工艺与方法,对沙坪2级水电站混凝土闸坝基坑开挖爆破振动进行了跟踪监测,对监测数据进行回归分析。结果表明,允许装药量由水平径向爆破振动控制,由此确定不同距离的最大单响药量,即当爆心距为10m和20m时,单响药量不大于4.2kg和33.2kg。在此基础上优化爆破设计,控制爆破振动危害。通过对预留岩坎爆前爆后声波检测结果对比分析,岩体纵波波速平均下降率均小于10%,说明基坑开挖爆破对预留岩坎影响甚微或未破坏。综合上述2种监测结果分析,说明开挖爆破方案较为合理,对预留岩坎的影响较小。In order to seek a scientific blasting controlled technology and method,we monitor the excavation blasting vibration of dam foundation pit at Shaping Ⅱ Hydropower Station.The regression analysis of the monitored data shows that the maximum explosive quantity is controlled by the blasting vibration of horizontal direction.When the distances between explosion sources and measuring points are 10 mand 20m,the corresponding maximum explosive quantities are 4.2kg and 33.2kg.Blasting design is based on it to control the harm of blasting vibration.Through the contrastive analysis of monitoring results of acoustic velocity before and after the explosion in reserved rock dyke,the average decline rate of the rock longitudinal wave is less than 10%.It illustrates the excavation blasting at dam foundation pit has little effect on remaining rock.Through the comprehensive analysis of two monitoring results above,the project of excavation blasting is reasonable and has little effect on the remaining rocks.It serve as a reference for similar construction.

关 键 词：沙坪2级水电站 爆破振动监测 方案优化 声波检测 

分 类 号：TV542[水利工程—水利水电工程]